Human vision vs computer power
2 April 2012 Last updated at 17:42 BST
The human eye is capable of processing visual information far more quickly than any computer.
While the human brain can instantly recognise objects or human faces, a computer has to add together the information pixel by pixel.
Horizon: The Hunt for AI is on BBC Two at 21:00 BST on Tuesday 3 April. Watch online (UK only) or see more clips at the above link.